package com.vint.leetcode;

import java.util.ArrayList;
import java.util.List;
import java.util.Stack;

//TODO: hard
/*
 */
public class Leetcode301 {
    public List<String> removeInvalidParentheses(String s) {
        List<String> ret = new ArrayList<String>();
        if(null==s||s.length()==0){
            return ret;
        }
        char[] src = s.toCharArray();
        Stack<Character> st = new Stack<Character>();
        for(int i=0; i < src.length; i++){

        }
        return ret;

    }
    public static void main(String[] args) {
    }
  }
